Chemical Thermodynamics Question 495
Question: Calculate $ \Delta H^{o} $ for evaporation of $ H_2O(l) $
$ H_2+\frac{1}{2}O_2\xrightarrow{,},H_2O(l);\Delta H=285.77kJ $ -(i) $ H_2+\frac{1}{2}O_2\xrightarrow{,},H_2O(g);,\Delta H=241.84kJ $ -(ii)
Options:
A) + 43.93 kJ
B) - 43.93 kJ
C) 527.61 kJ
D) - 527.61 kJ
Show Answer
Answer:
Correct Answer: B
Solution:
- Subtract Eq. (i) from (ii) to get $ H_2O,(l)\xrightarrow{,},H_2O,(g) $
$ -,285.77+241.84=-43.93 $
